# Question #84d78

You've answered your own question, it's $\text{NaO}$ $\left(1 : 1\right)$
Sodium peroxide is actually ${\text{Na"_2"O}}_{2}$, the simplest integer ratio of the two atoms ($\text{Na}$ and $\text{O}$) is $1 : 1$.
This means that your empirical formula is $\text{NaO}$.